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DS9118 Rev 14 91/149
STM32F303xB STM32F303xC Electrical characteristics
125
Input/output AC characteristics
The definition and values of input/output AC characteristics are given in Figure 23 and
Table 56, respectively.
Unless otherwise specified, the parameters given are derived from tests performed under
ambient temperature and V
DD
supply voltage conditions summarized in Table 24.
Table 56. I/O AC characteristics
(1)
OSPEEDRy [1:0]
value
(1)
Symbol Parameter Conditions Min Max Unit
x0
f
max(IO)out
Maximum frequency
(2)
C
L
= 50 pF, V
DD
= 2 V to 3.6 V - 2
(3)
MHz
t
f(IO)out
Output high to low level
fall time
C
L
= 50 pF, V
DD
= 2 V to 3.6 V
- 125
(3)
ns
t
r(IO)out
Output low to high level
rise time
- 125
(3)
01
f
max(IO)out
Maximum frequency
(2)
C
L
= 50 pF, V
DD
= 2 V to 3.6 V - 10
(3)
MHz
t
f(IO)out
Output high to low level
fall time
C
L
= 50 pF, V
DD
= 2 V to 3.6 V
-25
(3)
ns
t
r(IO)out
Output low to high level
rise time
-25
(3)
11
f
max(IO)out
Maximum frequency
(2)
C
L
= 30 pF, V
DD
= 2.7 V to 3.6 V - 50
(3)
MHz
C
L
= 50 pF, V
DD
= 2.7 V to 3.6 V - 30
(3)
MHz
C
L
= 50 pF, V
DD
= 2 V to 2.7 V - 20
(3)
MHz
t
f(IO)out
Output high to low level
fall time
C
L
= 30 pF, V
DD
= 2.7 V to 3.6 V - 5
(3)
ns
C
L
= 50 pF, V
DD
= 2.7 V to 3.6 V - 8
(3)
C
L
= 50 pF, V
DD
= 2 V to 2.7 V - 12
(3)
t
r(IO)out
Output low to high level
rise time
C
L
= 30 pF, V
DD
= 2.7 V to 3.6 V - 5
(3)
C
L
= 50 pF, V
DD
= 2.7 V to 3.6 V - 8
(3)
C
L
= 50 pF, V
DD
= 2 V to 2.7 V - 12
(3)
FM+
configuration
(4)
f
max(IO)out
Maximum frequency
(2)
C
L
= 50 pF, V
DD
= 2 V to 3.6 V
-2
(4)
MHz
t
f(IO)out
Output high to low level
fall time
-12
(4)
ns
t
r(IO)out
Output low to high level
rise time
-34
(4)
-t
EXTIpw
Pulse width of external
signals detected by the
EXTI controller
-10
(3)
-ns
1. The I/O speed is configured using the OSPEEDRx[1:0] bits. Refer to the RM0316 reference manual for a description of
GPIO Port configuration register.
2. The maximum frequency is defined in Figure 23.
3. Guaranteed by design.
4. The I/O speed configuration is bypassed in FM+ I/O mode. Refer to the STM32F303x STM32F313xx reference manual
RM0316 for a description of FM+ I/O mode configuration.
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